Three Kinds of Adaptations
Understand that animals have structural adaptations (body features like the giraffe's long neck, eagle's talons, dolphin's streamlined shape), behavioural adaptations (migration, hibernation, tool use), and physiological adaptations (antifreeze in Arctic fish blood, echolocation in bats), and that these developed over many generations through natural selection
What a learner can do afterwards
- Defines adaptation as a feature or behaviour that helps an animal survive in its environment
- Gives examples of structural, behavioural, and physiological adaptations
- Explains that adaptations develop over many generations, not during one animal's lifetime
- Connects adaptations to the concept of natural selection at a basic level
1 · Read
You already know some animals blend into their surroundings and some travel long distances each year. Those are both adaptations: features or behaviors that help an animal survive where it lives. Scientists sort adaptations into three groups. Structural adaptations are body parts, like a giraffe's long neck or an eagle's sharp talons. Behavioural adaptations are things an animal does, like migrating or hibernating. Physiological adaptations happen inside the body, like antifreeze in a fish's blood.
A woodpecker pecks a tree fast and hard, over and over. Its strong beak breaks into wood. Its long tongue reaches insects deep inside. Its skull absorbs the shock so its brain is not hurt. All three are structural adaptations: body parts built for this exact job.
Some adaptations you cannot see from outside. Arctic fish have a kind of antifreeze in their blood so it does not turn to ice in freezing water. That is a physiological adaptation. Bats send out sound waves and listen for the echoes to find insects in the dark, called echolocation, which is physiological too. Animals also adapt through behaviour: geese migrate south for winter, some bears hibernate through the cold months, and crows use twigs as tools to pull grubs out of bark.
No single animal grows a longer neck or gains antifreeze blood during its own life. Adaptations build up over many, many generations. Animals born with a helpful feature survive and have young more often, so the feature spreads. That slow process is called natural selection.
An adaptation is a feature or behaviour that helps an animal survive, and it builds up over many generations through natural selection, not in one animal's lifetime.
More to read
27.2 Features Used to Classify Animals
An adaptation is a body part or skill that helps an animal stay alive. Some are structural, built into the body. A giraffe neck reaches tall leaves, eagle talons grip prey, and a dolphin shape slips through water. Some are behavioural, ways of acting. Birds migrate to find food and bears hibernate through the lean months. Some are physiological, hidden workings inside. Arctic fish carry antifreeze in their blood and bats hunt with echolocation.
Adaptations build over countless years. Young with helpful parts live on. They raise young too. Bit by bit the whole kind shifts.
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2 · Watch
En anglaisTake it off screen
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